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| author | Andi Kleen <ak@suse.de> | 2006-12-07 02:14:12 +0100 |
|---|---|---|
| committer | Andi Kleen <andi@basil.nowhere.org> | 2006-12-07 02:14:12 +0100 |
| commit | e2124bb8d369a4bc1afde1959040e33d71c41d5e (patch) | |
| tree | 66edded37e2922f255b53645416fbfd0c2fd0cd8 /kernel | |
| parent | f3d73707a1e84f0687a05144b70b660441e999c7 (diff) | |
| download | linux-e2124bb8d369a4bc1afde1959040e33d71c41d5e.tar.gz linux-e2124bb8d369a4bc1afde1959040e33d71c41d5e.tar.bz2 linux-e2124bb8d369a4bc1afde1959040e33d71c41d5e.zip | |
[PATCH] unwinder: Use probe_kernel_address instead of __get_user in kernel/unwind.c
This avoids trouble with the page fault handler if the fault
happens inside an interrupt context.
Suggested by Linus
Cc: jbeulich@novell.com
Signed-off-by: Andi Kleen <ak@suse.de>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/unwind.c | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/kernel/unwind.c b/kernel/unwind.c index ed0a21d4a902..af48168a3afb 100644 --- a/kernel/unwind.c +++ b/kernel/unwind.c @@ -14,6 +14,7 @@ #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> @@ -550,7 +551,7 @@ static unsigned long read_pointer(const u8 **pLoc, return 0; } if ((ptrType & DW_EH_PE_indirect) - && __get_user(value, (unsigned long *)value)) + && probe_kernel_address((unsigned long *)value, value)) return 0; *pLoc = ptr.p8; @@ -982,18 +983,19 @@ 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 - @@ -1104,7 +1106,7 @@ int unwind(struct unwind_frame_info *frame) 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 |