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linux-user: fix Coverity CID 1464101 

target_mmap() can fail and return -1, but we don't check for that and
instead assume it's always valid.

Fixes: db2af69d6b ("linux-user: Add infrastructure for a signal trampoline page")
Cc: richard.henderson@linaro.org
Reported-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20211121151711.331653-1-laurent@vivier.eu>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Laurent Vivier 2021-11-21 16:17:11 +01:00
parent aee14c77f4
commit 802ae45e94
1 changed files with 7 additions and 3 deletions
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10
linux-user/elfload.c
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@ -3254,9 +3254,13 @@ int load_elf_binary(struct linux_binprm *bprm, struct image_info *info)
* Otherwise, allocate a private page to hold them.
*/
if (TARGET_ARCH_HAS_SIGTRAMP_PAGE) {
abi_ulong tramp_page = target_mmap(0, TARGET_PAGE_SIZE,
PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANON, -1, 0);
abi_long tramp_page = target_mmap(0, TARGET_PAGE_SIZE,
PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANON, -1, 0);
if (tramp_page == -1) {
return -errno;
}
setup_sigtramp(tramp_page);
target_mprotect(tramp_page, TARGET_PAGE_SIZE, PROT_READ | PROT_EXEC);
}