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author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2016-01-29 11:43:40 -0200 |
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committer | Adhemerval Zanella <adhemerval.zanella@linaro.com> | 2016-03-07 00:21:36 -0300 |
commit | f83bb9b8e97656ae0d3e2a31e859363e2d4d5832 (patch) | |
tree | 3360c4505fee657945315275c1a23d2347c52c08 /posix/execvpe.c | |
parent | fee9eb6200f0e44a4b684903bc47fde36d46f1a5 (diff) | |
download | glibc-f83bb9b8e97656ae0d3e2a31e859363e2d4d5832.tar.gz glibc-f83bb9b8e97656ae0d3e2a31e859363e2d4d5832.tar.xz glibc-f83bb9b8e97656ae0d3e2a31e859363e2d4d5832.zip |
posix: Remove dynamic memory allocation from execl{e,p}
GLIBC execl{e,p} implementation might use malloc if the total number of arguments exceed initial assumption size (1024). This might lead to issues in two situations: 1. execl/execle is stated to be async-signal-safe by POSIX [1]. However if execl is used in a signal handler with a large argument set (that may call malloc internally) and if the resulting call fails it might lead malloc in the program in a bad state. 2. If the functions are used in a vfork/clone(VFORK) situation it also might issue malloc internal bad state. This patch fixes it by using stack allocation instead. It also fixes BZ#19534. Tested on x86_64. [1] http://pubs.opengroup.org/onlinepubs/9699919799/functions/V2_chap02.html [BZ #19534] * posix/execl.c (execl): Remove dynamic memory allocation. * posix/execle.c (execle): Likewise. * posix/execlp.c (execlp): Likewise.
Diffstat (limited to 'posix/execvpe.c')
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