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| author | Joseph Myers <joseph@codesourcery.com> | 2022-12-22 19:37:09 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2022-12-22 19:37:09 +0000 |
| commit | c923cd8c496c7f253f327361a65c737233c7ebbd (patch) | |
| tree | aeb3b0d9672eb22149eb307764f981acdcbbf277 /malloc | |
| parent | 3c66c9600e285a42f042dd596859664b1d1372a7 (diff) | |
| download | glibc-c923cd8c496c7f253f327361a65c737233c7ebbd.tar.gz glibc-c923cd8c496c7f253f327361a65c737233c7ebbd.tar.xz glibc-c923cd8c496c7f253f327361a65c737233c7ebbd.zip | |
Avoid use of atoi in malloc
This patch is analogous to commit a3708cf6b0a5a68e2ed1ce3db28a03ed21d368d2. atoi has undefined behavior on out-of-range input, which makes it problematic to use anywhere in glibc that might be processing input out-of-range for atoi but not specified to produce undefined behavior for the function calling atoi. In conjunction with the C2x strtol changes, use of atoi in libc can also result in localplt test failures because the redirection for strtol does not interact properly with the libc_hidden_proto call for __isoc23_strtol for the call in the inline atoi implementation. In malloc/arena.c, this issue shows up for atoi calls that are only compiled for --disable-tunables (thus with the x86_64-linux-gnu-minimal configuration of build-many-glibcs.py, for example). Change those atoi calls to use strtol directly, as in the previous such changes. Tested for x86_64 (--disable-tunables).
Diffstat (limited to 'malloc')
| -rw-r--r-- | malloc/arena.c | 19 |
1 files changed, 12 insertions, 7 deletions
diff --git a/malloc/arena.c b/malloc/arena.c index f381f18371..840129e956 100644 --- a/malloc/arena.c +++ b/malloc/arena.c @@ -386,34 +386,39 @@ ptmalloc_init (void) if (!__builtin_expect (__libc_enable_secure, 0)) { if (memcmp (envline, "TOP_PAD_", 8) == 0) - __libc_mallopt (M_TOP_PAD, atoi (&envline[9])); + __libc_mallopt (M_TOP_PAD, strtol (&envline[9], NULL, 10)); else if (memcmp (envline, "PERTURB_", 8) == 0) - __libc_mallopt (M_PERTURB, atoi (&envline[9])); + __libc_mallopt (M_PERTURB, strtol (&envline[9], NULL, 10)); } break; case 9: if (!__builtin_expect (__libc_enable_secure, 0)) { if (memcmp (envline, "MMAP_MAX_", 9) == 0) - __libc_mallopt (M_MMAP_MAX, atoi (&envline[10])); + __libc_mallopt (M_MMAP_MAX, strtol (&envline[10], + NULL, 10)); else if (memcmp (envline, "ARENA_MAX", 9) == 0) - __libc_mallopt (M_ARENA_MAX, atoi (&envline[10])); + __libc_mallopt (M_ARENA_MAX, strtol (&envline[10], + NULL, 10)); } break; case 10: if (!__builtin_expect (__libc_enable_secure, 0)) { if (memcmp (envline, "ARENA_TEST", 10) == 0) - __libc_mallopt (M_ARENA_TEST, atoi (&envline[11])); + __libc_mallopt (M_ARENA_TEST, strtol (&envline[11], + NULL, 10)); } break; case 15: if (!__builtin_expect (__libc_enable_secure, 0)) { if (memcmp (envline, "TRIM_THRESHOLD_", 15) == 0) - __libc_mallopt (M_TRIM_THRESHOLD, atoi (&envline[16])); + __libc_mallopt (M_TRIM_THRESHOLD, strtol (&envline[16], + NULL, 10)); else if (memcmp (envline, "MMAP_THRESHOLD_", 15) == 0) - __libc_mallopt (M_MMAP_THRESHOLD, atoi (&envline[16])); + __libc_mallopt (M_MMAP_THRESHOLD, strtol (&envline[16], + NULL, 10)); } break; default: |