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author | Linus Torvalds <torvalds@woody.osdl.org> | 2006-12-07 08:59:11 -0800 |
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committer | Linus Torvalds <torvalds@woody.osdl.org> | 2006-12-07 08:59:11 -0800 |
commit | 4522d58275f124105819723e24e912c8e5bf3cdd (patch) | |
tree | b92c29014fadffe049c1925676037f0092b8d112 /kernel | |
parent | 6cf24f031bc97cb5a7c9df3b6e73c45b628b2b28 (diff) | |
parent | 64a26a731235b59c9d73bbe82c1f896d57400d37 (diff) | |
download | linux-4522d58275f124105819723e24e912c8e5bf3cdd.tar.gz linux-4522d58275f124105819723e24e912c8e5bf3cdd.tar.bz2 linux-4522d58275f124105819723e24e912c8e5bf3cdd.zip |
Merge branch 'for-linus' of git://one.firstfloor.org/home/andi/git/linux-2.6
* 'for-linus' of git://one.firstfloor.org/home/andi/git/linux-2.6: (156 commits)
[PATCH] x86-64: Export smp_call_function_single
[PATCH] i386: Clean up smp_tune_scheduling()
[PATCH] unwinder: move .eh_frame to RODATA
[PATCH] unwinder: fully support linker generated .eh_frame_hdr section
[PATCH] x86-64: don't use set_irq_regs()
[PATCH] x86-64: check vector in setup_ioapic_dest to verify if need setup_IO_APIC_irq
[PATCH] x86-64: Make ix86 default to HIGHMEM4G instead of NOHIGHMEM
[PATCH] i386: replace kmalloc+memset with kzalloc
[PATCH] x86-64: remove remaining pc98 code
[PATCH] x86-64: remove unused variable
[PATCH] x86-64: Fix constraints in atomic_add_return()
[PATCH] x86-64: fix asm constraints in i386 atomic_add_return
[PATCH] x86-64: Correct documentation for bzImage protocol v2.05
[PATCH] x86-64: replace kmalloc+memset with kzalloc in MTRR code
[PATCH] x86-64: Fix numaq build error
[PATCH] x86-64: include/asm-x86_64/cpufeature.h isn't a userspace header
[PATCH] unwinder: Add debugging output to the Dwarf2 unwinder
[PATCH] x86-64: Clarify error message in GART code
[PATCH] x86-64: Fix interrupt race in idle callback (3rd try)
[PATCH] x86-64: Remove unwind stack pointer alignment forcing again
...
Fixed conflict in include/linux/uaccess.h manually
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel')
-rw-r--r-- | kernel/fork.c | 2 | ||||
-rw-r--r-- | kernel/lockdep.c | 4 | ||||
-rw-r--r-- | kernel/sysctl.c | 9 | ||||
-rw-r--r-- | kernel/unwind.c | 203 |
4 files changed, 173 insertions, 45 deletions
diff --git a/kernel/fork.c b/kernel/fork.c index 658838148647..7f2e31ba33af 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -1319,7 +1319,7 @@ fork_out: return ERR_PTR(retval); } -struct pt_regs * __devinit __attribute__((weak)) idle_regs(struct pt_regs *regs) +noinline struct pt_regs * __devinit __attribute__((weak)) idle_regs(struct pt_regs *regs) { memset(regs, 0, sizeof(struct pt_regs)); return regs; diff --git a/kernel/lockdep.c b/kernel/lockdep.c index 62e73ce68197..b02032476dc2 100644 --- a/kernel/lockdep.c +++ b/kernel/lockdep.c @@ -221,11 +221,7 @@ static int save_trace(struct stack_trace *trace) trace->skip = 3; trace->all_contexts = 0; - /* Make sure to not recurse in case the the unwinder needs to tak -e locks. */ - lockdep_off(); save_stack_trace(trace, NULL); - lockdep_on(); trace->max_entries = trace->nr_entries; diff --git a/kernel/sysctl.c b/kernel/sysctl.c index 758dbbf972a5..8e9f00fd6d18 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -54,6 +54,7 @@ extern int proc_nr_files(ctl_table *table, int write, struct file *filp, #ifdef CONFIG_X86 #include <asm/nmi.h> +#include <asm/stacktrace.h> #endif #if defined(CONFIG_SYSCTL) @@ -707,6 +708,14 @@ static ctl_table kern_table[] = { .mode = 0444, .proc_handler = &proc_dointvec, }, + { + .ctl_name = CTL_UNNUMBERED, + .procname = "kstack_depth_to_print", + .data = &kstack_depth_to_print, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec, + }, #endif #if defined(CONFIG_MMU) { diff --git a/kernel/unwind.c b/kernel/unwind.c index ed0a21d4a902..09c261329249 100644 --- a/kernel/unwind.c +++ b/kernel/unwind.c @@ -14,11 +14,12 @@ #include <linux/bootmem.h> #include <linux/sort.h> #include <linux/stop_machine.h> +#include <linux/uaccess.h> #include <asm/sections.h> #include <asm/uaccess.h> #include <asm/unaligned.h> -extern char __start_unwind[], __end_unwind[]; +extern const char __start_unwind[], __end_unwind[]; extern const u8 __start_unwind_hdr[], __end_unwind_hdr[]; #define MAX_STACK_DEPTH 8 @@ -94,6 +95,7 @@ static const struct { typedef unsigned long uleb128_t; typedef signed long sleb128_t; +#define sleb128abs __builtin_labs static struct unwind_table { struct { @@ -135,6 +137,17 @@ struct unwind_state { static const struct cfa badCFA = { ARRAY_SIZE(reg_info), 1 }; +static unsigned unwind_debug; +static int __init unwind_debug_setup(char *s) +{ + unwind_debug = simple_strtoul(s, NULL, 0); + return 1; +} +__setup("unwind_debug=", unwind_debug_setup); +#define dprintk(lvl, fmt, args...) \ + ((void)(lvl > unwind_debug \ + || printk(KERN_DEBUG "unwind: " fmt "\n", ##args))) + static struct unwind_table *find_table(unsigned long pc) { struct unwind_table *table; @@ -151,7 +164,9 @@ static struct unwind_table *find_table(unsigned long pc) static unsigned long read_pointer(const u8 **pLoc, const void *end, - signed ptrType); + signed ptrType, + unsigned long text_base, + unsigned long data_base); static void init_unwind_table(struct unwind_table *table, const char *name, @@ -176,10 +191,13 @@ static void init_unwind_table(struct unwind_table *table, /* See if the linker provided table looks valid. */ if (header_size <= 4 || header_start[0] != 1 - || (void *)read_pointer(&ptr, end, header_start[1]) != table_start - || header_start[2] == DW_EH_PE_omit - || read_pointer(&ptr, end, header_start[2]) <= 0 - || header_start[3] == DW_EH_PE_omit) + || (void *)read_pointer(&ptr, end, header_start[1], 0, 0) + != table_start + || !read_pointer(&ptr, end, header_start[2], 0, 0) + || !read_pointer(&ptr, end, header_start[3], 0, + (unsigned long)header_start) + || !read_pointer(&ptr, end, header_start[3], 0, + (unsigned long)header_start)) header_start = NULL; table->hdrsz = header_size; smp_wmb(); @@ -269,7 +287,7 @@ static void __init setup_unwind_table(struct unwind_table *table, ptr = (const u8 *)(fde + 2); if (!read_pointer(&ptr, (const u8 *)(fde + 1) + *fde, - ptrType)) + ptrType, 0, 0)) return; ++n; } @@ -279,6 +297,7 @@ static void __init setup_unwind_table(struct unwind_table *table, hdrSize = 4 + sizeof(unsigned long) + sizeof(unsigned int) + 2 * n * sizeof(unsigned long); + dprintk(2, "Binary lookup table size for %s: %lu bytes", table->name, hdrSize); header = alloc(hdrSize); if (!header) return; @@ -303,7 +322,7 @@ static void __init setup_unwind_table(struct unwind_table *table, ptr = (const u8 *)(fde + 2); header->table[n].start = read_pointer(&ptr, (const u8 *)(fde + 1) + *fde, - fde_pointer_type(cie)); + fde_pointer_type(cie), 0, 0); header->table[n].fde = (unsigned long)fde; ++n; } @@ -486,7 +505,9 @@ static const u32 *cie_for_fde(const u32 *fde, const struct unwind_table *table) static unsigned long read_pointer(const u8 **pLoc, const void *end, - signed ptrType) + signed ptrType, + unsigned long text_base, + unsigned long data_base) { unsigned long value = 0; union { @@ -498,13 +519,17 @@ static unsigned long read_pointer(const u8 **pLoc, const unsigned long *pul; } ptr; - if (ptrType < 0 || ptrType == DW_EH_PE_omit) + if (ptrType < 0 || ptrType == DW_EH_PE_omit) { + dprintk(1, "Invalid pointer encoding %02X (%p,%p).", ptrType, *pLoc, end); return 0; + } ptr.p8 = *pLoc; switch(ptrType & DW_EH_PE_FORM) { case DW_EH_PE_data2: - if (end < (const void *)(ptr.p16u + 1)) + if (end < (const void *)(ptr.p16u + 1)) { + dprintk(1, "Data16 overrun (%p,%p).", ptr.p8, end); return 0; + } if(ptrType & DW_EH_PE_signed) value = get_unaligned(ptr.p16s++); else @@ -512,8 +537,10 @@ static unsigned long read_pointer(const u8 **pLoc, break; case DW_EH_PE_data4: #ifdef CONFIG_64BIT - if (end < (const void *)(ptr.p32u + 1)) + if (end < (const void *)(ptr.p32u + 1)) { + dprintk(1, "Data32 overrun (%p,%p).", ptr.p8, end); return 0; + } if(ptrType & DW_EH_PE_signed) value = get_unaligned(ptr.p32s++); else @@ -525,8 +552,10 @@ static unsigned long read_pointer(const u8 **pLoc, BUILD_BUG_ON(sizeof(u32) != sizeof(value)); #endif case DW_EH_PE_native: - if (end < (const void *)(ptr.pul + 1)) + if (end < (const void *)(ptr.pul + 1)) { + dprintk(1, "DataUL overrun (%p,%p).", ptr.p8, end); return 0; + } value = get_unaligned(ptr.pul++); break; case DW_EH_PE_leb128: @@ -534,10 +563,14 @@ static unsigned long read_pointer(const u8 **pLoc, value = ptrType & DW_EH_PE_signed ? get_sleb128(&ptr.p8, end) : get_uleb128(&ptr.p8, end); - if ((const void *)ptr.p8 > end) + if ((const void *)ptr.p8 > end) { + dprintk(1, "DataLEB overrun (%p,%p).", ptr.p8, end); return 0; + } break; default: + dprintk(2, "Cannot decode pointer type %02X (%p,%p).", + ptrType, ptr.p8, end); return 0; } switch(ptrType & DW_EH_PE_ADJUST) { @@ -546,12 +579,33 @@ static unsigned long read_pointer(const u8 **pLoc, case DW_EH_PE_pcrel: value += (unsigned long)*pLoc; break; + case DW_EH_PE_textrel: + if (likely(text_base)) { + value += text_base; + break; + } + dprintk(2, "Text-relative encoding %02X (%p,%p), but zero text base.", + ptrType, *pLoc, end); + return 0; + case DW_EH_PE_datarel: + if (likely(data_base)) { + value += data_base; + break; + } + dprintk(2, "Data-relative encoding %02X (%p,%p), but zero data base.", + ptrType, *pLoc, end); + return 0; default: + dprintk(2, "Cannot adjust pointer type %02X (%p,%p).", + ptrType, *pLoc, end); return 0; } if ((ptrType & DW_EH_PE_indirect) - && __get_user(value, (unsigned long *)value)) + && probe_kernel_address((unsigned long *)value, value)) { + dprintk(1, "Cannot read indirect value %lx (%p,%p).", + value, *pLoc, end); return 0; + } *pLoc = ptr.p8; return value; @@ -594,7 +648,8 @@ static signed fde_pointer_type(const u32 *cie) case 'P': { signed ptrType = *ptr++; - if (!read_pointer(&ptr, end, ptrType) || ptr > end) + if (!read_pointer(&ptr, end, ptrType, 0, 0) + || ptr > end) return -1; } break; @@ -654,7 +709,8 @@ static int processCFI(const u8 *start, case DW_CFA_nop: break; case DW_CFA_set_loc: - if ((state->loc = read_pointer(&ptr.p8, end, ptrType)) == 0) + state->loc = read_pointer(&ptr.p8, end, ptrType, 0, 0); + if (state->loc == 0) result = 0; break; case DW_CFA_advance_loc1: @@ -700,8 +756,10 @@ static int processCFI(const u8 *start, state->label = NULL; return 1; } - if (state->stackDepth >= MAX_STACK_DEPTH) + if (state->stackDepth >= MAX_STACK_DEPTH) { + dprintk(1, "State stack overflow (%p,%p).", ptr.p8, end); return 0; + } state->stack[state->stackDepth++] = ptr.p8; break; case DW_CFA_restore_state: @@ -716,8 +774,10 @@ static int processCFI(const u8 *start, result = processCFI(start, end, 0, ptrType, state); state->loc = loc; state->label = label; - } else + } else { + dprintk(1, "State stack underflow (%p,%p).", ptr.p8, end); return 0; + } break; case DW_CFA_def_cfa: state->cfa.reg = get_uleb128(&ptr.p8, end); @@ -749,6 +809,7 @@ static int processCFI(const u8 *start, break; case DW_CFA_GNU_window_save: default: + dprintk(1, "Unrecognized CFI op %02X (%p,%p).", ptr.p8[-1], ptr.p8 - 1, end); result = 0; break; } @@ -764,12 +825,17 @@ static int processCFI(const u8 *start, set_rule(*ptr.p8++ & 0x3f, Nowhere, 0, state); break; } - if (ptr.p8 > end) + if (ptr.p8 > end) { + dprintk(1, "Data overrun (%p,%p).", ptr.p8, end); result = 0; + } if (result && targetLoc != 0 && targetLoc < state->loc) return 1; } + if (result && ptr.p8 < end) + dprintk(1, "Data underrun (%p,%p).", ptr.p8, end); + return result && ptr.p8 == end && (targetLoc == 0 @@ -786,7 +852,7 @@ int unwind(struct unwind_frame_info *frame) #define FRAME_REG(r, t) (((t *)frame)[reg_info[r].offs]) const u32 *fde = NULL, *cie = NULL; const u8 *ptr = NULL, *end = NULL; - unsigned long pc = UNW_PC(frame) - frame->call_frame; + unsigned long pc = UNW_PC(frame) - frame->call_frame, sp; unsigned long startLoc = 0, endLoc = 0, cfa; unsigned i; signed ptrType = -1; @@ -813,9 +879,9 @@ int unwind(struct unwind_frame_info *frame) ptr = hdr + 4; end = hdr + table->hdrsz; if (tableSize - && read_pointer(&ptr, end, hdr[1]) + && read_pointer(&ptr, end, hdr[1], 0, 0) == (unsigned long)table->address - && (i = read_pointer(&ptr, end, hdr[2])) > 0 + && (i = read_pointer(&ptr, end, hdr[2], 0, 0)) > 0 && i == (end - ptr) / (2 * tableSize) && !((end - ptr) % (2 * tableSize))) { do { @@ -823,7 +889,8 @@ int unwind(struct unwind_frame_info *frame) startLoc = read_pointer(&cur, cur + tableSize, - hdr[3]); + hdr[3], 0, + (unsigned long)hdr); if (pc < startLoc) i /= 2; else { @@ -834,13 +901,17 @@ int unwind(struct unwind_frame_info *frame) if (i == 1 && (startLoc = read_pointer(&ptr, ptr + tableSize, - hdr[3])) != 0 + hdr[3], 0, + (unsigned long)hdr)) != 0 && pc >= startLoc) fde = (void *)read_pointer(&ptr, ptr + tableSize, - hdr[3]); + hdr[3], 0, + (unsigned long)hdr); } } + if(hdr && !fde) + dprintk(3, "Binary lookup for %lx failed.", pc); if (fde != NULL) { cie = cie_for_fde(fde, table); @@ -851,17 +922,19 @@ int unwind(struct unwind_frame_info *frame) && (ptrType = fde_pointer_type(cie)) >= 0 && read_pointer(&ptr, (const u8 *)(fde + 1) + *fde, - ptrType) == startLoc) { + ptrType, 0, 0) == startLoc) { if (!(ptrType & DW_EH_PE_indirect)) ptrType &= DW_EH_PE_FORM|DW_EH_PE_signed; endLoc = startLoc + read_pointer(&ptr, (const u8 *)(fde + 1) + *fde, - ptrType); + ptrType, 0, 0); if(pc >= endLoc) fde = NULL; } else fde = NULL; + if(!fde) + dprintk(1, "Binary lookup result for %lx discarded.", pc); } if (fde == NULL) { for (fde = table->address, tableSize = table->size; @@ -881,7 +954,7 @@ int unwind(struct unwind_frame_info *frame) ptr = (const u8 *)(fde + 2); startLoc = read_pointer(&ptr, (const u8 *)(fde + 1) + *fde, - ptrType); + ptrType, 0, 0); if (!startLoc) continue; if (!(ptrType & DW_EH_PE_indirect)) @@ -889,10 +962,12 @@ int unwind(struct unwind_frame_info *frame) endLoc = startLoc + read_pointer(&ptr, (const u8 *)(fde + 1) + *fde, - ptrType); + ptrType, 0, 0); if (pc >= startLoc && pc < endLoc) break; } + if(!fde) + dprintk(3, "Linear lookup for %lx failed.", pc); } } if (cie != NULL) { @@ -926,6 +1001,8 @@ int unwind(struct unwind_frame_info *frame) if (ptr >= end || *ptr) cie = NULL; } + if(!cie) + dprintk(1, "CIE unusable (%p,%p).", ptr, end); ++ptr; } if (cie != NULL) { @@ -935,7 +1012,12 @@ int unwind(struct unwind_frame_info *frame) state.dataAlign = get_sleb128(&ptr, end); if (state.codeAlign == 0 || state.dataAlign == 0 || ptr >= end) cie = NULL; - else { + else if (UNW_PC(frame) % state.codeAlign + || UNW_SP(frame) % sleb128abs(state.dataAlign)) { + dprintk(1, "Input pointer(s) misaligned (%lx,%lx).", + UNW_PC(frame), UNW_SP(frame)); + return -EPERM; + } else { retAddrReg = state.version <= 1 ? *ptr++ : get_uleb128(&ptr, end); /* skip augmentation */ if (((const char *)(cie + 2))[1] == 'z') { @@ -949,6 +1031,8 @@ int unwind(struct unwind_frame_info *frame) || reg_info[retAddrReg].width != sizeof(unsigned long)) cie = NULL; } + if(!cie) + dprintk(1, "CIE validation failed (%p,%p).", ptr, end); } if (cie != NULL) { state.cieStart = ptr; @@ -962,11 +1046,15 @@ int unwind(struct unwind_frame_info *frame) if ((ptr += augSize) > end) fde = NULL; } + if(!fde) + dprintk(1, "FDE validation failed (%p,%p).", ptr, end); } if (cie == NULL || fde == NULL) { #ifdef CONFIG_FRAME_POINTER unsigned long top, bottom; + if ((UNW_SP(frame) | UNW_FP(frame)) % sizeof(unsigned long)) + return -EPERM; top = STACK_TOP(frame->task); bottom = STACK_BOTTOM(frame->task); # if FRAME_RETADDR_OFFSET < 0 @@ -982,18 +1070,19 @@ int unwind(struct unwind_frame_info *frame) & (sizeof(unsigned long) - 1))) { unsigned long link; - if (!__get_user(link, + if (!probe_kernel_address( (unsigned long *)(UNW_FP(frame) - + FRAME_LINK_OFFSET)) + + FRAME_LINK_OFFSET), + link) # if FRAME_RETADDR_OFFSET < 0 && link > bottom && link < UNW_FP(frame) # else && link > UNW_FP(frame) && link < bottom # endif && !(link & (sizeof(link) - 1)) - && !__get_user(UNW_PC(frame), + && !probe_kernel_address( (unsigned long *)(UNW_FP(frame) - + FRAME_RETADDR_OFFSET))) { + + FRAME_RETADDR_OFFSET), UNW_PC(frame))) { UNW_SP(frame) = UNW_FP(frame) + FRAME_RETADDR_OFFSET # if FRAME_RETADDR_OFFSET < 0 - @@ -1016,8 +1105,11 @@ int unwind(struct unwind_frame_info *frame) || state.regs[retAddrReg].where == Nowhere || state.cfa.reg >= ARRAY_SIZE(reg_info) || reg_info[state.cfa.reg].width != sizeof(unsigned long) - || state.cfa.offs % sizeof(unsigned long)) + || FRAME_REG(state.cfa.reg, unsigned long) % sizeof(unsigned long) + || state.cfa.offs % sizeof(unsigned long)) { + dprintk(1, "Unusable unwind info (%p,%p).", ptr, end); return -EIO; + } /* update frame */ #ifndef CONFIG_AS_CFI_SIGNAL_FRAME if(frame->call_frame @@ -1036,10 +1128,14 @@ int unwind(struct unwind_frame_info *frame) #else # define CASES CASE(8); CASE(16); CASE(32); CASE(64) #endif + pc = UNW_PC(frame); + sp = UNW_SP(frame); for (i = 0; i < ARRAY_SIZE(state.regs); ++i) { if (REG_INVALID(i)) { if (state.regs[i].where == Nowhere) continue; + dprintk(1, "Cannot restore register %u (%d).", + i, state.regs[i].where); return -EIO; } switch(state.regs[i].where) { @@ -1048,8 +1144,11 @@ int unwind(struct unwind_frame_info *frame) case Register: if (state.regs[i].value >= ARRAY_SIZE(reg_info) || REG_INVALID(state.regs[i].value) - || reg_info[i].width > reg_info[state.regs[i].value].width) + || reg_info[i].width > reg_info[state.regs[i].value].width) { + dprintk(1, "Cannot restore register %u from register %lu.", + i, state.regs[i].value); return -EIO; + } switch(reg_info[state.regs[i].value].width) { #define CASE(n) \ case sizeof(u##n): \ @@ -1059,6 +1158,9 @@ int unwind(struct unwind_frame_info *frame) CASES; #undef CASE default: + dprintk(1, "Unsupported register size %u (%lu).", + reg_info[state.regs[i].value].width, + state.regs[i].value); return -EIO; } break; @@ -1083,12 +1185,17 @@ int unwind(struct unwind_frame_info *frame) CASES; #undef CASE default: + dprintk(1, "Unsupported register size %u (%u).", + reg_info[i].width, i); return -EIO; } break; case Value: - if (reg_info[i].width != sizeof(unsigned long)) + if (reg_info[i].width != sizeof(unsigned long)) { + dprintk(1, "Unsupported value size %u (%u).", + reg_info[i].width, i); return -EIO; + } FRAME_REG(i, unsigned long) = cfa + state.regs[i].value * state.dataAlign; break; @@ -1100,15 +1207,20 @@ int unwind(struct unwind_frame_info *frame) % sizeof(unsigned long) || addr < startLoc || addr + sizeof(unsigned long) < addr - || addr + sizeof(unsigned long) > endLoc) + || addr + sizeof(unsigned long) > endLoc) { + dprintk(1, "Bad memory location %lx (%lx).", + addr, state.regs[i].value); return -EIO; + } switch(reg_info[i].width) { #define CASE(n) case sizeof(u##n): \ - __get_user(FRAME_REG(i, u##n), (u##n *)addr); \ + probe_kernel_address((u##n *)addr, FRAME_REG(i, u##n)); \ break CASES; #undef CASE default: + dprintk(1, "Unsupported memory size %u (%u).", + reg_info[i].width, i); return -EIO; } } @@ -1116,6 +1228,17 @@ int unwind(struct unwind_frame_info *frame) } } + if (UNW_PC(frame) % state.codeAlign + || UNW_SP(frame) % sleb128abs(state.dataAlign)) { + dprintk(1, "Output pointer(s) misaligned (%lx,%lx).", + UNW_PC(frame), UNW_SP(frame)); + return -EIO; + } + if (pc == UNW_PC(frame) && sp == UNW_SP(frame)) { + dprintk(1, "No progress (%lx,%lx).", pc, sp); + return -EIO; + } + return 0; #undef CASES #undef FRAME_REG |