diff options
author | Al Viro <viro@zeniv.linux.org.uk> | 2017-05-02 19:52:17 -0400 |
---|---|---|
committer | Al Viro <viro@zeniv.linux.org.uk> | 2017-07-03 18:44:02 -0400 |
commit | 468138d78510688fb5476f98d23f11ac6a63229a (patch) | |
tree | 5f235bc85343bf3f314201a1d281881625d67abe /arch | |
parent | 2ea659a9ef488125eb46da6eb571de5eae5c43f6 (diff) | |
download | linux-468138d78510688fb5476f98d23f11ac6a63229a.tar.gz linux-468138d78510688fb5476f98d23f11ac6a63229a.tar.bz2 linux-468138d78510688fb5476f98d23f11ac6a63229a.zip |
binfmt_flat: flat_{get,put}_addr_from_rp() should be able to fail
on MMU targets EFAULT is possible here. Make both return 0 or error,
passing what used to be the return value of flat_get_addr_from_rp()
by reference.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'arch')
-rw-r--r-- | arch/arm/include/asm/flat.h | 25 | ||||
-rw-r--r-- | arch/blackfin/include/asm/flat.h | 25 | ||||
-rw-r--r-- | arch/blackfin/kernel/flat.c | 13 | ||||
-rw-r--r-- | arch/c6x/include/asm/flat.h | 15 | ||||
-rw-r--r-- | arch/h8300/include/asm/flat.h | 24 | ||||
-rw-r--r-- | arch/m32r/include/asm/flat.h | 19 | ||||
-rw-r--r-- | arch/m68k/include/asm/flat.h | 23 | ||||
-rw-r--r-- | arch/microblaze/include/asm/flat.h | 34 | ||||
-rw-r--r-- | arch/sh/include/asm/flat.h | 15 | ||||
-rw-r--r-- | arch/xtensa/include/asm/flat.h | 15 |
10 files changed, 145 insertions, 63 deletions
diff --git a/arch/arm/include/asm/flat.h b/arch/arm/include/asm/flat.h index acf1d14b89a6..29d3a1524bce 100644 --- a/arch/arm/include/asm/flat.h +++ b/arch/arm/include/asm/flat.h @@ -5,12 +5,31 @@ #ifndef __ARM_FLAT_H__ #define __ARM_FLAT_H__ +#include <linux/uaccess.h> + #define flat_argvp_envp_on_stack() 1 #define flat_old_ram_flag(flags) (flags) #define flat_reloc_valid(reloc, size) ((reloc) <= (size)) -#define flat_get_addr_from_rp(rp, relval, flags, persistent) \ - ({ unsigned long __val; __get_user_unaligned(__val, rp); __val; }) -#define flat_put_addr_at_rp(rp, val, relval) __put_user_unaligned(val, rp) + +static inline int flat_get_addr_from_rp(u32 __user *rp, u32 relval, u32 flags, + u32 *addr, u32 *persistent) +{ +#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS + return copy_from_user(addr, rp, 4) ? -EFAULT : 0; +#else + return get_user(*addr, rp); +#endif +} + +static inline int flat_put_addr_at_rp(u32 __user *rp, u32 addr, u32 rel) +{ +#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS + return copy_to_user(rp, &addr, 4) ? -EFAULT : 0; +#else + return put_user(addr, rp); +#endif +} + #define flat_get_relocate_addr(rel) (rel) #define flat_set_persistent(relval, p) 0 diff --git a/arch/blackfin/include/asm/flat.h b/arch/blackfin/include/asm/flat.h index c1314c56dd18..296d7f56fbfd 100644 --- a/arch/blackfin/include/asm/flat.h +++ b/arch/blackfin/include/asm/flat.h @@ -14,23 +14,28 @@ #define flat_argvp_envp_on_stack() 0 #define flat_old_ram_flag(flags) (flags) -extern unsigned long bfin_get_addr_from_rp (unsigned long *ptr, - unsigned long relval, - unsigned long flags, - unsigned long *persistent); +extern unsigned long bfin_get_addr_from_rp (u32 *ptr, u32 relval, + u32 flags, u32 *persistent); -extern void bfin_put_addr_at_rp(unsigned long *ptr, unsigned long addr, - unsigned long relval); +extern void bfin_put_addr_at_rp(u32 *ptr, u32 addr, u32 relval); /* The amount by which a relocation can exceed the program image limits without being regarded as an error. */ #define flat_reloc_valid(reloc, size) ((reloc) <= (size)) -#define flat_get_addr_from_rp(rp, relval, flags, persistent) \ - bfin_get_addr_from_rp(rp, relval, flags, persistent) -#define flat_put_addr_at_rp(rp, val, relval) \ - bfin_put_addr_at_rp(rp, val, relval) +static inline int flat_get_addr_from_rp(u32 __user *rp, u32 relval, u32 flags, + u32 *addr, u32 *persistent) +{ + *addr = bfin_get_addr_from_rp(rp, relval, flags, persistent); + return 0; +} + +static inline int flat_put_addr_at_rp(u32 __user *rp, u32 val, u32 relval) +{ + bfin_put_addr_at_rp(rp, val, relval); + return 0; +} /* Convert a relocation entry into an address. */ static inline unsigned long diff --git a/arch/blackfin/kernel/flat.c b/arch/blackfin/kernel/flat.c index b5b658449616..d29ab6a2e909 100644 --- a/arch/blackfin/kernel/flat.c +++ b/arch/blackfin/kernel/flat.c @@ -13,14 +13,14 @@ #define FLAT_BFIN_RELOC_TYPE_16H_BIT 1 #define FLAT_BFIN_RELOC_TYPE_32_BIT 2 -unsigned long bfin_get_addr_from_rp(unsigned long *ptr, - unsigned long relval, - unsigned long flags, - unsigned long *persistent) +unsigned long bfin_get_addr_from_rp(u32 *ptr, + u32 relval, + u32 flags, + u32 *persistent) { unsigned short *usptr = (unsigned short *)ptr; int type = (relval >> 26) & 7; - unsigned long val; + u32 val; switch (type) { case FLAT_BFIN_RELOC_TYPE_16_BIT: @@ -59,8 +59,7 @@ EXPORT_SYMBOL(bfin_get_addr_from_rp); * Insert the address ADDR into the symbol reference at RP; * RELVAL is the raw relocation-table entry from which RP is derived */ -void bfin_put_addr_at_rp(unsigned long *ptr, unsigned long addr, - unsigned long relval) +void bfin_put_addr_at_rp(u32 *ptr, u32 addr, u32 relval) { unsigned short *usptr = (unsigned short *)ptr; int type = (relval >> 26) & 7; diff --git a/arch/c6x/include/asm/flat.h b/arch/c6x/include/asm/flat.h index a1858bd5f6c8..6f1feb00bd52 100644 --- a/arch/c6x/include/asm/flat.h +++ b/arch/c6x/include/asm/flat.h @@ -1,11 +1,22 @@ #ifndef __ASM_C6X_FLAT_H #define __ASM_C6X_FLAT_H +#include <asm/unaligned.h> + #define flat_argvp_envp_on_stack() 0 #define flat_old_ram_flag(flags) (flags) #define flat_reloc_valid(reloc, size) ((reloc) <= (size)) -#define flat_get_addr_from_rp(rp, relval, flags, p) get_unaligned(rp) -#define flat_put_addr_at_rp(rp, val, relval) put_unaligned(val, rp) +static inline int flat_get_addr_from_rp(u32 __user *rp, u32 relval, u32 flags, + u32 *addr, u32 *persistent) +{ + *addr = get_unaligned((__force u32 *)rp); + return 0; +} +static inline int flat_put_addr_at_rp(u32 __user *rp, u32 addr, u32 rel) +{ + put_unaligned(addr, (__force u32 *)rp); + return 0; +} #define flat_get_relocate_addr(rel) (rel) #define flat_set_persistent(relval, p) 0 diff --git a/arch/h8300/include/asm/flat.h b/arch/h8300/include/asm/flat.h index a4898eccf2bf..18d024251738 100644 --- a/arch/h8300/include/asm/flat.h +++ b/arch/h8300/include/asm/flat.h @@ -5,6 +5,8 @@ #ifndef __H8300_FLAT_H__ #define __H8300_FLAT_H__ +#include <asm/unaligned.h> + #define flat_argvp_envp_on_stack() 1 #define flat_old_ram_flag(flags) 1 #define flat_reloc_valid(reloc, size) ((reloc) <= (size)) @@ -18,11 +20,21 @@ */ #define flat_get_relocate_addr(rel) (rel & ~0x00000001) -#define flat_get_addr_from_rp(rp, relval, flags, persistent) \ - ({(void)persistent; \ - get_unaligned(rp) & (((flags) & FLAT_FLAG_GOTPIC) ? \ - 0xffffffff : 0x00ffffff); }) -#define flat_put_addr_at_rp(rp, addr, rel) \ - put_unaligned(((*(char *)(rp)) << 24) | ((addr) & 0x00ffffff), (rp)) +static inline int flat_get_addr_from_rp(u32 __user *rp, u32 relval, u32 flags, + u32 *addr, u32 *persistent) +{ + u32 val = get_unaligned((__force u32 *)rp); + if (!(flags & FLAT_FLAG_GOTPIC) + val &= 0x00ffffff; + *addr = val; + return 0; +} + +static inline int flat_put_addr_at_rp(u32 __user *rp, u32 addr, u32 rel) +{ + u32 *p = (__force u32 *)rp; + put_unaligned((addr & 0x00ffffff) | (*(char *)p << 24), p); + return 0; +} #endif /* __H8300_FLAT_H__ */ diff --git a/arch/m32r/include/asm/flat.h b/arch/m32r/include/asm/flat.h index 5d711c4688fb..455ce7ddbf14 100644 --- a/arch/m32r/include/asm/flat.h +++ b/arch/m32r/include/asm/flat.h @@ -17,11 +17,6 @@ #define flat_set_persistent(relval, p) 0 #define flat_reloc_valid(reloc, size) \ (((reloc) - textlen_for_m32r_lo16_data) <= (size)) -#define flat_get_addr_from_rp(rp, relval, flags, persistent) \ - m32r_flat_get_addr_from_rp(rp, relval, (text_len) ) - -#define flat_put_addr_at_rp(rp, addr, relval) \ - m32r_flat_put_addr_at_rp(rp, addr, relval) /* Convert a relocation entry into an address. */ static inline unsigned long @@ -57,9 +52,9 @@ flat_get_relocate_addr (unsigned long relval) static unsigned long textlen_for_m32r_lo16_data = 0; -static inline unsigned long m32r_flat_get_addr_from_rp (unsigned long *rp, - unsigned long relval, - unsigned long textlen) +static inline unsigned long m32r_flat_get_addr_from_rp (u32 *rp, + u32 relval, + u32 textlen) { unsigned int reloc = flat_m32r_get_reloc_type (relval); textlen_for_m32r_lo16_data = 0; @@ -100,9 +95,7 @@ static inline unsigned long m32r_flat_get_addr_from_rp (unsigned long *rp, return ~0; /* bogus value */ } -static inline void m32r_flat_put_addr_at_rp (unsigned long *rp, - unsigned long addr, - unsigned long relval) +static inline void flat_put_addr_at_rp(u32 *rp, u32 addr, u32 relval) { unsigned int reloc = flat_m32r_get_reloc_type (relval); if (reloc & 0xf0) { @@ -142,4 +135,8 @@ static inline void m32r_flat_put_addr_at_rp (unsigned long *rp, } } +// kludge - text_len is a local variable in the only user. +#define flat_get_addr_from_rp(rp, relval, flags, addr, persistent) \ + (m32r_flat_get_addr_from_rp(rp, relval, text_len), 0) + #endif /* __ASM_M32R_FLAT_H */ diff --git a/arch/m68k/include/asm/flat.h b/arch/m68k/include/asm/flat.h index 00c392b0cabd..48b62790fe70 100644 --- a/arch/m68k/include/asm/flat.h +++ b/arch/m68k/include/asm/flat.h @@ -5,12 +5,29 @@ #ifndef __M68KNOMMU_FLAT_H__ #define __M68KNOMMU_FLAT_H__ +#include <linux/uaccess.h> + #define flat_argvp_envp_on_stack() 1 #define flat_old_ram_flag(flags) (flags) #define flat_reloc_valid(reloc, size) ((reloc) <= (size)) -#define flat_get_addr_from_rp(rp, relval, flags, p) \ - ({ unsigned long __val; __get_user_unaligned(__val, rp); __val; }) -#define flat_put_addr_at_rp(rp, val, relval) __put_user_unaligned(val, rp) +static inline int flat_get_addr_from_rp(u32 __user *rp, u32 relval, u32 flags, + u32 *addr, u32 *persistent) +{ +#ifdef CONFIG_CPU_HAS_NO_UNALIGNED + return copy_from_user(addr, rp, 4) ? -EFAULT : 0; +#else + return get_user(*addr, rp); +#endif +} + +static inline int flat_put_addr_at_rp(u32 __user *rp, u32 addr, u32 rel) +{ +#ifdef CONFIG_CPU_HAS_NO_UNALIGNED + return copy_to_user(rp, &addr, 4) ? -EFAULT : 0; +#else + return put_user(addr, rp); +#endif +} #define flat_get_relocate_addr(rel) (rel) static inline int flat_set_persistent(unsigned long relval, diff --git a/arch/microblaze/include/asm/flat.h b/arch/microblaze/include/asm/flat.h index 6847c1512c7b..f23c3d266bae 100644 --- a/arch/microblaze/include/asm/flat.h +++ b/arch/microblaze/include/asm/flat.h @@ -32,29 +32,27 @@ * reference */ -static inline unsigned long -flat_get_addr_from_rp(unsigned long *rp, unsigned long relval, - unsigned long flags, unsigned long *persistent) +static inline int flat_get_addr_from_rp(u32 __user *rp, u32 relval, u32 flags, + u32 *addr, u32 *persistent) { - unsigned long addr; - (void)flags; + u32 *p = (__force u32 *)rp; /* Is it a split 64/32 reference? */ if (relval & 0x80000000) { /* Grab the two halves of the reference */ - unsigned long val_hi, val_lo; + u32 val_hi, val_lo; - val_hi = get_unaligned(rp); - val_lo = get_unaligned(rp+1); + val_hi = get_unaligned(p); + val_lo = get_unaligned(p+1); /* Crack the address out */ - addr = ((val_hi & 0xffff) << 16) + (val_lo & 0xffff); + *addr = ((val_hi & 0xffff) << 16) + (val_lo & 0xffff); } else { /* Get the address straight out */ - addr = get_unaligned(rp); + *addr = get_unaligned(p); } - return addr; + return 0; } /* @@ -63,25 +61,27 @@ flat_get_addr_from_rp(unsigned long *rp, unsigned long relval, */ static inline void -flat_put_addr_at_rp(unsigned long *rp, unsigned long addr, unsigned long relval) +flat_put_addr_at_rp(u32 __user *rp, u32 addr, u32 relval) { + u32 *p = (__force u32 *)rp; /* Is this a split 64/32 reloc? */ if (relval & 0x80000000) { /* Get the two "halves" */ - unsigned long val_hi = get_unaligned(rp); - unsigned long val_lo = get_unaligned(rp + 1); + unsigned long val_hi = get_unaligned(p); + unsigned long val_lo = get_unaligned(p + 1); /* insert the address */ val_hi = (val_hi & 0xffff0000) | addr >> 16; val_lo = (val_lo & 0xffff0000) | (addr & 0xffff); /* store the two halves back into memory */ - put_unaligned(val_hi, rp); - put_unaligned(val_lo, rp+1); + put_unaligned(val_hi, p); + put_unaligned(val_lo, p+1); } else { /* Put it straight in, no messing around */ - put_unaligned(addr, rp); + put_unaligned(addr, p); } + return 0; } #define flat_get_relocate_addr(rel) (rel & 0x7fffffff) diff --git a/arch/sh/include/asm/flat.h b/arch/sh/include/asm/flat.h index 5d84df5e27f6..275fcae23539 100644 --- a/arch/sh/include/asm/flat.h +++ b/arch/sh/include/asm/flat.h @@ -12,11 +12,22 @@ #ifndef __ASM_SH_FLAT_H #define __ASM_SH_FLAT_H +#include <asm/unaligned.h> + #define flat_argvp_envp_on_stack() 0 #define flat_old_ram_flag(flags) (flags) #define flat_reloc_valid(reloc, size) ((reloc) <= (size)) -#define flat_get_addr_from_rp(rp, relval, flags, p) get_unaligned(rp) -#define flat_put_addr_at_rp(rp, val, relval) put_unaligned(val,rp) +static inline int flat_get_addr_from_rp(u32 __user *rp, u32 relval, u32 flags, + u32 *addr, u32 *persistent) +{ + *addr = get_unaligned((__force u32 *)rp); + return 0; +} +static inline int flat_put_addr_at_rp(u32 __user *rp, u32 addr, u32 rel) +{ + put_unaligned(addr, (__force u32 *)rp); + return 0; +} #define flat_get_relocate_addr(rel) (rel) #define flat_set_persistent(relval, p) ({ (void)p; 0; }) diff --git a/arch/xtensa/include/asm/flat.h b/arch/xtensa/include/asm/flat.h index 94c44abf15e4..60e0d6a45795 100644 --- a/arch/xtensa/include/asm/flat.h +++ b/arch/xtensa/include/asm/flat.h @@ -1,11 +1,22 @@ #ifndef __ASM_XTENSA_FLAT_H #define __ASM_XTENSA_FLAT_H +#include <asm/unaligned.h> + #define flat_argvp_envp_on_stack() 0 #define flat_old_ram_flag(flags) (flags) #define flat_reloc_valid(reloc, size) ((reloc) <= (size)) -#define flat_get_addr_from_rp(rp, relval, flags, p) get_unaligned(rp) -#define flat_put_addr_at_rp(rp, val, relval ) put_unaligned(val, rp) +static inline int flat_get_addr_from_rp(u32 __user *rp, u32 relval, u32 flags, + u32 *addr, u32 *persistent) +{ + *addr = get_unaligned((__force u32 *)rp); + return 0; +} +static inline int flat_put_addr_at_rp(u32 __user *rp, u32 addr, u32 rel) +{ + put_unaligned(addr, (__force u32 *)rp); + return 0; +} #define flat_get_relocate_addr(rel) (rel) #define flat_set_persistent(relval, p) 0 |