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Merge "Improve diagnostics from the assembler __strcpy_chk routines."

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Elliott Hughes 2016-05-27 15:19:09 +00:00 committed by Gerrit Code Review
commit 2f82dc50ed
5 changed files with 28 additions and 65 deletions
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18
libc/arch-arm/cortex-a15/bionic/__strcpy_chk_common.S
View file

@ -147,23 +147,15 @@ ENTRY(__strcpy_chk)
pld [r1, #0]
pld [r1, #64]
ldr r0, [sp]
cmp r3, lr
bhs .L_strcpy_chk_failed
// Add 1 for copy length to get the string terminator.
add r2, r3, #1
cmp r2, lr
itt hi
movhi r0, r2
bhi __strcpy_chk_fail
#include MEMCPY_BASE
.L_strcpy_chk_failed:
ldr r0, error_message
1:
add r0, pc
bl __fortify_fatal
error_message:
.word error_string-(1b+4)
END(__strcpy_chk)
.data
error_string:
.string "strcpy: prevented write past end of buffer"

25
libc/arch-arm/cortex-a9/bionic/__strcpy_chk.S
View file

@ -149,33 +149,18 @@ ENTRY(__strcpy_chk)
pld [r1, #0]
pld [r1, #64]
ldr r0, [sp]
cmp r3, lr
bhs __strcpy_chk_fail
// Add 1 for copy length to get the string terminator.
add r2, r3, #1
cmp r2, lr
itt hi
movhi r0, r2
bhi __strcpy_chk_fail
// Fall through into the memcpy_base function.
END(__strcpy_chk)
#define MEMCPY_BASE __strcpy_chk_memcpy_base
#define MEMCPY_BASE_ALIGNED __strcpy_chk_memcpy_base_aligned
#include "memcpy_base.S"
ENTRY_PRIVATE(__strcpy_chk_fail)
.cfi_def_cfa_offset 8
.cfi_rel_offset r0, 0
.cfi_rel_offset lr, 4
ldr r0, error_message
1:
add r0, pc
bl __fortify_fatal
error_message:
.word error_string-(1b+4)
END(__strcpy_chk_fail)
.data
error_string:
.string "strcpy: prevented write past end of buffer"

26
libc/arch-arm/denver/bionic/__strcpy_chk.S
View file

@ -147,30 +147,18 @@ ENTRY(__strcpy_chk)
pld [r1, #0]
pld [r1, #64]
ldr r0, [sp]
cmp r3, lr
bhs __strcpy_chk_failed
// Add 1 for copy length to get the string terminator.
add r2, r3, #1
cmp r2, lr
itt hi
movhi r0, r2
bhi __strcpy_chk_fail
// Fall through into the memcpy_base function.
END(__strcpy_chk)
#define MEMCPY_BASE __strcpy_chk_memcpy_base
#define MEMCPY_BASE_ALIGNED __strcpy_chk_memcpy_base_aligned
#include "memcpy_base.S"
ENTRY_PRIVATE(__strcpy_chk_failed)
.cfi_def_cfa_offset 8
.cfi_rel_offset r0, 0
.cfi_rel_offset lr, 4
ldr r0, error_message
1:
add r0, pc
bl __fortify_fatal
error_message:
.word error_string-(1b+4)
END(__strcpy_chk_failed)
.data
error_string:
.string "strcpy: prevented write past end of buffer"

18
libc/arch-arm/krait/bionic/__strcpy_chk.S
View file

@ -147,23 +147,15 @@ ENTRY(__strcpy_chk)
pld [r1, #0]
pld [r1, #64]
ldr r0, [sp]
cmp r3, lr
bhs .L_strcpy_chk_failed
// Add 1 for copy length to get the string terminator.
add r2, r3, #1
cmp r2, lr
itt hi
movhi r0, r2
bhi __strcpy_chk_fail
#include "memcpy_base.S"
.L_strcpy_chk_failed:
ldr r0, error_message
1:
add r0, pc
bl __fortify_fatal
error_message:
.word error_string-(1b+4)
END(__strcpy_chk)
.data
error_string:
.string "strcpy: prevented write past end of buffer"

6
libc/bionic/fortify.cpp
View file

@ -288,6 +288,12 @@ char* __strchr_chk(const char* p, int ch, size_t s_len) {
}
}
// strcpy is performance-critical enough that we have assembler __strcpy_chk implementations.
// This function is used to give better diagnostics than we can easily do from assembler.
extern "C" void __strcpy_chk_fail(size_t dst_buf_size) {
__fortify_fatal("strcpy: prevented write past end of %zu-byte buffer", dst_buf_size);
}
size_t __strlcat_chk(char* dst, const char* src,
size_t supplied_size, size_t dst_len_from_compiler) {
__check_buffer_access("strlcat", "write into", supplied_size, dst_len_from_compiler);